JPH09269012A - Thrust bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of abnormal abrasion and seizure of an inner peripheral part of a load side thrust bearing by suppressing temperature rise of the inner peripheral side of the load side thrust bearing. SOLUTION: In a thrust bearing, a collar 4 rotating together with a rotary shaft 1 is in sliding contact with a load side thrust bearing 6 fixed to a casing 5 for generating thrust load performance. Cooling liquid is supplied from upward through a liquid supply hole 30 to a cooling groove 21 circularly formed on an inner peripheral side of the load side thrust bearing 6 around the rotary shaft 1. The cooling liquid supplied from the hole 30 to the cooling groove 32 is discharged through a liquid discharge hole 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust bearing applied to a supercharger of an engine.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of a conventional taper land type thrust bearing used for a supercharger of an engine. In the figure, a collar 4 is fixed to a rotary shaft 1 via a spacer 2 and a tightening nut 3. A load side thrust bearing 6 is fixed to the casing 5, and a white metal 7 is cast on the side in sliding contact with the collar 4. A plurality of taper land pads 8 are provided on the sliding contact surface of the white metal 7. To the oil groove 9 of the load side thrust bearing 6, the oil supply hole 1 provided in the casing 5 is provided.
0, lubricating oil is supplied at a constant pressure through the circumferential oil groove 11 on the outer peripheral portion of the load side thrust bearing 6, the oil supply hole 12 provided in each pad 8, the nozzle 13 and the like. This lubricating oil is supplied to each pad 8 in the shape of a taper land, and the wedge action of the pad 8 generates load capacity. Lubricating oil leaked to the inner peripheral side of the load side thrust bearing 6 collects in the space portion 14,
Finally, it flows toward the nut 3 side and is discharged to the outside. Further, the casing 5 has an anti-load side thrust bearing 15
Are fixed and the lubricating oil is supplied by a mechanism similar to that of the load side thrust bearing 6.

Lubricating oil that has entered the oil groove 9 from the nozzle portion 13 flows to the taper portion 16 of the pad 8 and reaches the land portion 17, during which fluid dynamic pressure is generated by the wedge action and load capacity is produced. An inner peripheral shroud 18 is provided on the inner peripheral side of the taper portion 16 and an outer peripheral shroud 19 is provided on the outer peripheral side thereof to prevent the lubricating oil from leaking to the inner and outer peripheries and lowering the fluid dynamic pressure. There is.

[0004]

In the conventional taper land type thrust bearing as described above, a part of the lubricating oil whose pressure has become high due to the wedge action in the taper portion 16 is generated in the collar 4 and the inner peripheral side shroud 18. It leaks to the inner peripheral side of the bearing through the gap and flows toward the tightening nut 3 through the gap 14 between the rotating spacer 2 and the inner peripheral surface of the stationary load side thrust bearing 6. Since the amount of lubricating oil leaking to the inner peripheral side is small, the leaking lubricating oil takes a long time to pass through the gap 14, and during that time, it receives viscous friction and becomes high temperature.
Therefore, the temperature on the inner peripheral side of the load side thrust bearing 6 becomes high. On the other hand, the lubricating oil leaking to the outer peripheral side of the load side thrust bearing 6 cools the outer peripheral side of the load side thrust bearing 6 without staying in a narrow space because it is discharged by centrifugal force.

In this way, the inner peripheral side of the load side thrust bearing 6 becomes higher in temperature than the outer peripheral side, so that a difference in the amount of thermal expansion in the axial direction occurs, and the oil film thickness on the inner peripheral side becomes thin. Therefore, the temperature increase on the inner peripheral side may be further accelerated, and the inner peripheral portion of the load side thrust bearing 6 may come into contact with the collar 4 to cause abnormal wear.

[0006]

SUMMARY OF THE INVENTION The thrust bearing according to the present invention is intended to solve the above-mentioned problems, and the thrust load capacity is achieved by slidable contact between the collar rotating with the rotary shaft and the load side thrust bearing fixed to the casing. In the thrust bearing that generates the above, the liquid supply hole supplies the cooling liquid from the upper side in the cooling groove formed in an annular shape around the rotation shaft on the inner peripheral side of the load side thrust bearing and from the liquid supply hole. A drain hole discharges the supplied cooling liquid in the cooling groove downward. As described above, in this thrust bearing, the cooling groove is formed on the inner peripheral side of the load side thrust bearing, and the cooling liquid supplied from the upper liquid supply hole is provided on the inner peripheral side of the load side thrust bearing. The cooling water enters the cooling groove to cool the inner peripheral side of the load side thrust bearing, falls downward, and is discharged from the drainage hole below. This suppresses the temperature rise on the inner peripheral side of the load side thrust bearing.

[0007]

1 and 2 are explanatory views of a tapered land type thrust bearing according to an embodiment of the present invention. In the figure, a taper land type thrust bearing according to the present embodiment is used for an engine supercharger or the like. In the figure, reference numeral 1 is a rotary shaft, 2 is a spacer, 3 is a tightening nut, 4 is a collar, 5 Is a casing, 6 is a load side thrust bearing, 7 is white metal, 8 is a pad, 9
Is an oil groove, 10 is a lubricating oil supply hole, 11 is a circumferential oil groove, 1
2 is a lubricating oil supply hole, 13 is a nozzle portion, 14 is a space portion,
15 is an anti-load side thrust bearing, 30 is a cooling oil supply hole,
31 is an O-ring, 32 is a cooling groove, 33 is a cooling oil drain hole, and 34 is an O-ring groove.

This taper land type thrust bearing has a structure similar to that of the conventional taper land type thrust bearing shown in FIG. 3, but in this taper land type thrust bearing, as shown in the figure, the load side thrust bearing 6 is used. A cooling groove 32 is provided in the circumferential direction on the inner peripheral side of the casing 5. The cooling groove 32 does not penetrate the sliding contact surface with the collar 4 and does not penetrate the casing 5.
There is an opening on the contact surface with. Further, an oil supply hole for cooling oil communicating with the cooling groove 32 is provided above the casing 5 to which the load side thrust bearing 6 is fixed, and an oil discharge hole 33 for cooling oil communicating with the cooling groove 32 is provided below. ing. An O-ring groove 34 is provided on the inner peripheral side of the casing 5 in the circumferential direction, and the O-ring 31 prevents oil leakage from the contact surface with the load side thrust bearing 6.

The cooling oil supplied from the oil supply hole 30 provided in the casing 5 is sent to above the cooling groove 32 provided in the circumferential direction on the inner peripheral side of the rear surface of the load side thrust bearing 6, and the load side thrust bearing 6 While cooling the inner peripheral side of the, it falls and is discharged from an oil drain hole 33 provided below the casing 5.

In the conventional taper land type thrust bearing, a part of the lubricating oil whose pressure is increased by the wedge action in the taper portion leaks to the inner peripheral side of the bearing through the gap between the collar and the inner peripheral side shroud, and rotates. Flows toward the tightening nut through the gap between the stationary spacer and the stationary inner peripheral surface of the load side thrust bearing. Since the amount of lubricating oil leaking to the inner peripheral side is small, the leaking lubricating oil takes a long time to pass through the gap, and during that time, it receives viscous friction and becomes high temperature. Therefore, the temperature on the inner peripheral side of the load side thrust bearing becomes high. On the other hand, the lubricating oil leaking to the outer peripheral side of the load side thrust bearing does not stay in the narrow space because it is discharged by the centrifugal force, and thus cools the outer peripheral side of the load side thrust bearing. In this way, the inner peripheral side of the load side thrust bearing has a higher temperature than the outer peripheral side, so that a difference in the amount of thermal expansion in the axial direction occurs and the oil film thickness on the inner peripheral side becomes thin. Therefore, the temperature rise on the inner peripheral side is further accelerated, and the inner peripheral portion of the load side thrust bearing may come into contact with the collar, causing abnormal wear.
In this taper land type thrust bearing, the load side bearing 6
A cooling groove 32 that is continuous in the circumferential direction is provided on the inner peripheral side of the back surface, and an oil supply hole 30 that communicates with the cooling groove 32 is provided above the casing 5 surface that is in contact with the back surface of the load-side thrust bearing 6. An oil drain hole 33 is provided below in communication with 32, and the lubricating oil supplied from the oil supply hole 10 above the casing 5 enters into the cooling groove 33 provided on the inner peripheral side of the load side thrust bearing 6. , The inner peripheral side of the load side thrust bearing 6 is cooled and dropped downward, and the oil drain hole 3 at the bottom of the casing 5
Emitted from 3. By thus providing the cooling groove 32 on the inner peripheral side of the load side thrust bearing 6 and suppressing the temperature rise, seizure or the like on the inner peripheral side of the load side thrust bearing 6 can be prevented.

The present invention is not limited to the taper land type thrust bearing, but the same action and effect can be obtained by applying the present invention to a step land type thrust bearing.

[0012]

The thrust bearing according to the present invention is constructed as described above, and since the temperature rise on the inner peripheral side of the load side thrust bearing is suppressed, abnormal wear of the inner peripheral part of the load side thrust bearing and It is possible to prevent seizure.

[Brief description of drawings]

FIG. 1 is a sectional view of a tapered land type thrust bearing according to one embodiment of the present invention.

2 (a) is a sectional view taken along the line AA in FIG. 1, and FIG. 2 (b) is a sectional view taken along the line BB.

3A is a sectional view of a conventional taper land type thrust bearing, and FIG. 3B is a plan view of a sliding contact surface thereof.

[Explanation of symbols]

 1 Rotating Shaft 2 Spacer 3 Tightening Nut 4 Collar 5 Casing 6 Load Side Thrust Bearing 7 White Metal 8 Pad 9 Oil Groove 10 Lubricating Oil Lubrication Hole 11 Circular Oil Groove 12 Lubricating Oil Lubrication Hole 13 Nozzle 14 Space 15 Anti-load side thrust bearing 30 Cooling oil supply hole 31 O-ring 32 Cooling groove 33 Cooling oil drain hole 34 O-ring groove

Claims (1)

[Claims] 1. A thrust bearing in which a collar rotating with a rotating shaft and a load side thrust bearing fixed to a casing are in sliding contact with each other to generate a thrust load capacity, wherein the rotating shaft is provided on an inner peripheral side of the load side thrust bearing. A cooling groove formed in an annular shape at the center, a liquid supply hole for supplying a cooling liquid into the cooling groove from above, and a cooling liquid in the cooling groove supplied from the liquid supply hole downward. A thrust bearing having a drainage hole for discharging.